脱合金化制备纳米多孔Ni、NiO阳极材料及其电催化析氧性能

doi:10.11896/cldb.18090290

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Abstract Nanoporous Ni was prepared by a combined method of rapid quenching and de-alloying, and then prepared samples were heated to synthesize the nanoporous NiO. The phase, morphology, microstructure and pore-size distribution of nanoporous Ni and NiO were analyzed by XRD, SEM, TEM, BET respectively.The electrochemical performance was investigated by cyclic voltammetry, electrochemical steady-state polarization and electrochemical impendence spectroscopy (EIS). The results showed that nanoporous Ni could be obtained after de-alloying of Ni₁₅Al₈₅ and Ni₅Al₉₅ alloy. The bore diameter and skeleton strength of Ni decreased as the Al content increased. Under the current density of 10 mA·cm^-2, oxygen evolution reaction overpotential of nanoporous Ni drove from Ni₅Al₉₅ alloy was 95 mV lower than nanoporous Ni from Ni₁₅Al₈₅ alloy. However, with the reaction proceeded, collapse and detachment of the surface holes reduced the stability of oxygen evolution. NiO inherited the nanoporous structure of Ni, and further increased the specific surface area and skeleton strength of the electrode. Under the current density of 10 mA·cm^-2, oxygen evolution reaction overpotential of nanoporous NiO electrode was only 357 mV, which lower than Ni electrode 14.3 mV. The apparent exchange current density of NiO electrode toward the OER was 1.2 times as high as that of nickel electrode in room temperature, the apparent activation energy reduced 8.59 kJ·mol^-1, after 1 000 cycles, overpotential of NiO minished 12 mV (J=100 mA·cm^-2), nanoporous NiO drove from Ni₅Al₉₅ alloy had superior electrocatalytic properties toward the oxygen evolution reaction and favorable stability.

Key words： rapid quenching de-alloying nanoporous Ni oxygen evolution reaction anode material electrolysis of water

Published: 16 September 2019

CLC number:	TG146.1
	TQ138.1

Fund:This work was financially supported by the National Natural Science Foundation of China (51661018).

About author:: Qi Zhouis currently a professor and doctoral supervisor in Lanzhou University of technology. Her research interests are corrosion and protection of materials, microstructure and properties of materials, preparation technology and application of new energy materials. She has published more than 60 journal papers as the first author.

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ZHOU Qi,REN Xiangrong. Nanoporous Ni and NiO Prepared by De-alloying as Anodes for Electrocatalytic Oxygen Evolution Reaction[J]. Materials Reports, 2019, 33(22): 3701-3707.

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http://www.mater-rep.com/EN/10.11896/cldb.18090290 OR http://www.mater-rep.com/EN/Y2019/V33/I22/3701

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